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The enigma of rare Quaternary oolites in the Indian and Pacific Oceans: A result of global oceanographic physicochemical conditions or a sampling bias?
Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia.
Rhein Westfal TH Aachen, Geol Inst, EMR Energy & Mineral Resources Grp, Wuellnerstr 2, D-52056 Aachen, Germany.
Geol Survey Norway, Postal Box 6315 Torgarden, N-7491 Trondheim, Norway.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
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2018 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 200, p. 114-122Article in journal (Refereed) Published
Abstract [en]

Marine ooids are iconic indicators of shallow seawater carbonate saturation state, and their formation has traditionally been ascribed to physicochemical processes. The Indo-Pacific stands out as a region devoid of oolites, particularly during the Quaternary: the "ooid enigma". Here we present results from recent coring by the International Ocean Discovery Program (IODP Expedition 356) off west Australia that shows that ooid horizons are common in Pleistocene strata up to 730,000 years old. Extensive "ooid factories" were created due to the presence of long-lived tidally influenced flat topped tropical platforms suitable for intermittent ooid accretion over hundreds to thousands of years during highstands and times of lower sea level. This work suggests marine ooids may actually be more common in Indo-Pacific than previously reported. Past global ocean alkalinity was elevated during Pleistocene glacial periods and continental climate was generally more arid in the Indo-Pacific region compared to interglacials and the Holocene. Therefore, increased aridity associated with higher alkalinity conditions during the glacials facilitated ooid precipitation on adjacent tropical carbonate platforms particularly offshore from arid Australia. This confluence of factors suggests that more "ooid factories" may be encountered by further coring Indo-Pacific regions with Pleistocene flat long-lived carbonate shelves. However, Indo-Pacific Quaternary ooid occurrences outside Australia are rare, suggesting that the Northwest Shelf may be a unique archive of this non-skeletal precipitate. Further investigations into the petrography and geochemistry of pre-Holocene ooid occurrences will provide insights into their origin and the relative role of biotic, physicochemical and other factors in their formation. (C) 2018 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 200, p. 114-122
Keywords [en]
Quaternary, Holocene, Southern Pacific, Oolites, Ooids, Indo-Pacific, Northwest Shelf Australia, Aridity, Skeletal grains, Indian Ocean, Pacific Ocean
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-371875DOI: 10.1016/j.quascirev.2018.09.028ISI: 000449900900007OAI: oai:DiVA.org:uu-371875DiVA, id: diva2:1275622
Funder
Swedish Research Council, VR 2016-04434Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07Bibliographically approved

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Henderiks, Jorijntje

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